<!DOCTYPE html>
<html>
  <body>
    <div style="display:table">
      <div style="display: table-row">
        <div style="display: table-cell">
          First Column
        </div>
        <div style="display: table-cell">
          Second Column
        </div>
      </div>
      <div style="display: table-row">
        <div style="display: table-cell">
          First Column
        </div>
        <div style="display: -moz-popup; display: popup"></div>
        <div style="display: table-cell">
          Second Column
        </div>
      </div>
    </div>
  </body>
</html>
